Santo & Johnny - Sleepwalk. A brilliant instrumental that sets the mood for rainy days. I have played this song on repeat many times and it never becomes stale. Wonderful job on the steel guitar; simple and tasteful, a true classic.
Frankie Valli and the Four Seasons - Rag Doll. Opening with a drum kick and impressive vocal harmony followed by the scratchy voiced singer you have a song that is destined for repeated listening. The lyrics are not intriguing, but is shouldn't matter with a melody that's so juicy.